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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e1489b8c23ff288fabbc21758fa0ed01e66cc47738d0e2d287e5f3c8c96ae29' 
  AND token = 's/zmHEyn+GsafcbZmO1NPIHbOeguSdSimR0NRZNs8Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}